Tube-pulling apparatus

Details Tube-pulling apparatus Tube-pulling apparatus

1981-06-06

1983-01-25

Crane, Daniel C.

Metal working

Means to assemble or disassemble

Heat exchanger

29252, 29282, B23P 1904, B23P 1526

Patent

active

043695698

ABSTRACT:
Tube-pulling apparatus include expandable gripping jaws and an expansion rod adapted to expand the gripping jaws so that they grip an inner wall of a tube to be pulled from a tube sheet. A first piston, which is connected to the expansion rod, moves the expansion rod relative to the gripping jaws to effect their expansion. After the gripping jaws are fully expanded, the first piston cooperates with a second piston, which is connected to the gripping jaws, to conjointly retract the expansion rod and the gripping jaws, thereby extracting the tube. If the gripping jaws are misadjusted resulting in their complete expansion before the first piston assumes its cooperative relationship with the second piston, retraction of the second piston is prevented, thereby automatically aborting the tube-pulling operation to prevent damage to the tube sheet.

REFERENCES:
patent: 1964023 (1934-06-01), Armstrong
patent: 2697872 (1954-12-01), Armstrong
patent: 3367011 (1968-02-01), Sipher
patent: 3369287 (1968-02-01), Brochetti
patent: 3791011 (1974-02-01), Keys
patent: 3835520 (1974-09-01), Sismore
patent: 4000556 (1977-01-01), Ciminero
patent: 4077102 (1978-03-01), Smith
patent: 4095335 (1978-06-01), Lassarat

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